Two police officers are being investigated over videos which show them allegedly knocking mobiles out of the hands of members of the public who were trying to film them over separate incidents.

One case in Glasgow shows a man's mobile knocked to the ground and apparently smashed by an officer.

Another video, filmed during an arrest in Edinburgh, shows an officer marching towards the cameraman and smacking the mobile out of the way. The man involved claimed he was arrested immediately afterwards.

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A clip filmed in Glasgow shows a man's mobile knocked to the ground and apparently smashed by a Strathclyde officer

The first video uploaded in June 2012 shows a Strathclyde Police officer approach a group of men in Glasgow after a girl in a nightclub claimed they 'annoyed her'.

During the 9 minute-long exchange, viewed by more than 1,300 users, the officer repeatedly tells the group: 'If you annoy somebody then it is a breach of the peace'.

A Strathclyde Police spokeswoman said: 'We have received no complaint in relation to this incident.

'We have passed on the footage and will look into the matter.

'In general terms, the police have no powers to stop the public filming or taking photographs, but this can very much depend on the circumstances.'

But they were unavailable to comment on what these circumstances may be.

The two Forces behind the two incidents seen on YouTube confirmed they are investigating the footage.

The uploaders of each video were unavailable for comment.

John Scott QC, top defence lawyer and former chair of the Scottish Human Rights Centre, said that police need to be reminded of their public duties.

He said that recording devices are a 'useful tool' to help bringing justice, but said they could make an exchange 'more heated'.'

In 2010 a letter was circulated by the Association of Chief Police Officers in Scotland (ACPOS) that confirmed the public have 'no powers' to stop the public filming them.

The letter, draughted by David McCall, assistant chief constable for British Transport Police, reads: 'I seek your support in reminding your officers and staff that they should not prevent anyone from taking photographs in public.

'There are no powers prohibiting the taking of photographs, film or digital images in public places.

'Therefore members of the public and press should not be prevented from doing so.

'Once an image has been recorded, the police have no power to delete or confiscate it.'